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216 lines
4.2 KiB
216 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Copyright (c) 2016 Facebook |
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*/ |
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#define _GNU_SOURCE |
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#include <sched.h> |
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#include <errno.h> |
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#include <stdio.h> |
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#include <sys/types.h> |
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#include <asm/unistd.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <assert.h> |
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#include <sys/wait.h> |
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#include <stdlib.h> |
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#include <signal.h> |
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#include <linux/bpf.h> |
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#include <string.h> |
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#include <time.h> |
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#include <sys/resource.h> |
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#include <bpf/bpf.h> |
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#include <bpf/libbpf.h> |
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#define MAX_CNT 1000000 |
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static struct bpf_link *links[2]; |
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static struct bpf_object *obj; |
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static int cnt; |
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static __u64 time_get_ns(void) |
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{ |
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struct timespec ts; |
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clock_gettime(CLOCK_MONOTONIC, &ts); |
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return ts.tv_sec * 1000000000ull + ts.tv_nsec; |
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} |
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static void test_task_rename(int cpu) |
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{ |
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__u64 start_time; |
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char buf[] = "test\n"; |
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int i, fd; |
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fd = open("/proc/self/comm", O_WRONLY|O_TRUNC); |
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if (fd < 0) { |
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printf("couldn't open /proc\n"); |
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exit(1); |
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} |
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start_time = time_get_ns(); |
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for (i = 0; i < MAX_CNT; i++) { |
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if (write(fd, buf, sizeof(buf)) < 0) { |
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printf("task rename failed: %s\n", strerror(errno)); |
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close(fd); |
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return; |
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} |
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} |
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printf("task_rename:%d: %lld events per sec\n", |
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cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); |
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close(fd); |
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} |
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static void test_urandom_read(int cpu) |
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{ |
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__u64 start_time; |
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char buf[4]; |
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int i, fd; |
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fd = open("/dev/urandom", O_RDONLY); |
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if (fd < 0) { |
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printf("couldn't open /dev/urandom\n"); |
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exit(1); |
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} |
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start_time = time_get_ns(); |
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for (i = 0; i < MAX_CNT; i++) { |
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if (read(fd, buf, sizeof(buf)) < 0) { |
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printf("failed to read from /dev/urandom: %s\n", strerror(errno)); |
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close(fd); |
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return; |
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} |
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} |
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printf("urandom_read:%d: %lld events per sec\n", |
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cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); |
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close(fd); |
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} |
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static void loop(int cpu, int flags) |
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{ |
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cpu_set_t cpuset; |
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CPU_ZERO(&cpuset); |
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CPU_SET(cpu, &cpuset); |
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sched_setaffinity(0, sizeof(cpuset), &cpuset); |
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if (flags & 1) |
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test_task_rename(cpu); |
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if (flags & 2) |
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test_urandom_read(cpu); |
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} |
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static void run_perf_test(int tasks, int flags) |
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{ |
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pid_t pid[tasks]; |
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int i; |
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for (i = 0; i < tasks; i++) { |
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pid[i] = fork(); |
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if (pid[i] == 0) { |
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loop(i, flags); |
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exit(0); |
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} else if (pid[i] == -1) { |
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printf("couldn't spawn #%d process\n", i); |
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exit(1); |
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} |
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} |
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for (i = 0; i < tasks; i++) { |
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int status; |
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assert(waitpid(pid[i], &status, 0) == pid[i]); |
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assert(status == 0); |
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} |
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} |
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static int load_progs(char *filename) |
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{ |
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struct bpf_program *prog; |
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int err = 0; |
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obj = bpf_object__open_file(filename, NULL); |
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err = libbpf_get_error(obj); |
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if (err < 0) { |
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fprintf(stderr, "ERROR: opening BPF object file failed\n"); |
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return err; |
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} |
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/* load BPF program */ |
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err = bpf_object__load(obj); |
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if (err < 0) { |
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fprintf(stderr, "ERROR: loading BPF object file failed\n"); |
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return err; |
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} |
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bpf_object__for_each_program(prog, obj) { |
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links[cnt] = bpf_program__attach(prog); |
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err = libbpf_get_error(links[cnt]); |
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if (err < 0) { |
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fprintf(stderr, "ERROR: bpf_program__attach failed\n"); |
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links[cnt] = NULL; |
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return err; |
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} |
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cnt++; |
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} |
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return err; |
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} |
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static void unload_progs(void) |
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{ |
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while (cnt) |
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bpf_link__destroy(links[--cnt]); |
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bpf_object__close(obj); |
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} |
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int main(int argc, char **argv) |
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{ |
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int num_cpu = sysconf(_SC_NPROCESSORS_ONLN); |
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int test_flags = ~0; |
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char filename[256]; |
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int err = 0; |
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if (argc > 1) |
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test_flags = atoi(argv[1]) ? : test_flags; |
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if (argc > 2) |
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num_cpu = atoi(argv[2]) ? : num_cpu; |
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if (test_flags & 0x3) { |
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printf("BASE\n"); |
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run_perf_test(num_cpu, test_flags); |
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} |
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if (test_flags & 0xC) { |
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snprintf(filename, sizeof(filename), |
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"%s_kprobe_kern.o", argv[0]); |
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printf("w/KPROBE\n"); |
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err = load_progs(filename); |
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if (!err) |
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run_perf_test(num_cpu, test_flags >> 2); |
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unload_progs(); |
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} |
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if (test_flags & 0x30) { |
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snprintf(filename, sizeof(filename), |
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"%s_tp_kern.o", argv[0]); |
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printf("w/TRACEPOINT\n"); |
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err = load_progs(filename); |
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if (!err) |
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run_perf_test(num_cpu, test_flags >> 4); |
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unload_progs(); |
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} |
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if (test_flags & 0xC0) { |
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snprintf(filename, sizeof(filename), |
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"%s_raw_tp_kern.o", argv[0]); |
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printf("w/RAW_TRACEPOINT\n"); |
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err = load_progs(filename); |
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if (!err) |
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run_perf_test(num_cpu, test_flags >> 6); |
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unload_progs(); |
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} |
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return err; |
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}
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